1   /*
2    * Copyright (C) 2007 The Guava Authors
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package com.google.common.collect.testing.testers;
18  
19  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
20  
21  import com.google.common.annotations.GwtCompatible;
22  import com.google.common.collect.testing.AbstractMapTester;
23  import com.google.common.collect.testing.features.CollectionSize;
24  
25  /**
26   * A generic JUnit test which tests {@code isEmpty()} operations on a
27   * map. Can't be invoked directly; please see
28   * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
29   *
30   * @author Kevin Bourrillion
31   */
32  @GwtCompatible
33  public class MapIsEmptyTester<K, V> extends AbstractMapTester<K, V> {
34    @CollectionSize.Require(ZERO)
35    public void testIsEmpty_yes() {
36      assertTrue("isEmpty() should return true", getMap().isEmpty());
37    }
38  
39    @CollectionSize.Require(absent = ZERO)
40    public void testIsEmpty_no() {
41      assertFalse("isEmpty() should return false", getMap().isEmpty());
42    }
43  }